coastal processes ~ erosion, transport & deposition 12.1 nc ca

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Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

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Page 1: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Coastal Processes ~erosion, transport & deposition

12.1

NCCA

Page 3: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Erosional processes

• Abrasion = continuous tumbling reduces rock to sand grains

• Solution = salt dissolves some of the rock• Scouring = wave swirls at base of cliff &

loosens rock

Page 4: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Erosion

• Erosional processes in action• http://www.bbc.co.uk/schools/gcsebitesize/ge

ography/coastal/coastalprocessesrev3.shtml

Page 5: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Erosional Features

• Sea cliff• Sea cave• Sea arch• Sea stack• Terrace

Page 6: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Sea cliffNavassa Island, Caribbean Sea

• Forms when waves erode rock

http://coastal.er.usgs.gov/navassa/photos/ep/hike/CliffE.jpg

Page 7: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Sea caveShort Sands Beach, Oregon

• Hole eroded at base of cliff

http://web.cecs.pdx.edu/~walpole/pics/kayak/falcon/cave3.jpg

Page 8: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Sea archHawaii

• Sea cuts through headland

http://upload.wikimedia.org/wikipedia/commons/e/eb/SeaArchHawaii.jpg

Page 9: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Sea stackCounty Mayo, Ireland

http://ts1.mm.bing.net/images/thumbnail.aspx?q=1023555809064&id=45685568345e0ba48cec1d6807ea14ba&url=http%3a%2f%2fwww.visualphotos.com%2fphoto%2f2x4004071%2fdoonbristy_sea_stack_downpatrick_head_ballycastle_1813001.jpg

Isolated column of rock

Page 10: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Sea terracesHaiti

• Flat platforms at water height

http://www.amishkin.com/wp-content/uploads/2010/03/P1000346-Large.jpg

Page 11: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Features

Page 12: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Transport

• Material eroded by the sea is moved along the beaches.

Page 13: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Longshore drift

• Longshore drift illustration• http://www.bbc.co.uk/schools/gcsebitesize/ge

ography/coastal/coastalprocessesrev4.shtml• Waves approach beach at angle• Sand moves in zig zag motion• Creates longshore current• Current keeps sand moving until it hits a

change or structure, then it drops out.

Page 14: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Longshore drift diagram

http://cgz.e2bn.net/e2bn/leas/c99/schools/cgz/accounts/staff/rchambers/GeoBytes%20GCSE%20Blog%20Resources/Images/Coasts/Longshore_Drift.jpg

Page 15: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA
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Deposition

• Sand deposits form where amount of rock moving toward shore is greater than amount moving away.

Page 18: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA
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Page 20: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Depositional Features

• Beach• Lagoon• Tombolo• Barrier island

Page 21: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

BeachEmerald Isle, NC

http://www.tripadvisor.com/LocationPhotos-g49113-Emerald_Isle_North_Carolina.html

Page 22: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Lagoon

Vegetation is red; water is blue (satellite image)

Page 23: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Tombolo

web.macam.ac.il

Bar that extends out into ocean, but remains connected to mainland.

web.macam.ac.il

Page 24: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Barrier Island

http://www.frf.usace.army.mil/outerbanksaerialflight/Index.htm

Page 25: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Barrier Islands

• Occur on east coast of USA• Isolated dunes become islands• Parallel to shore• Associated features:– Sound (also called bay or lagoon)– Tidal inlets– Tidal flats– Estuaries

Page 26: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

HUMAN EFFECTS ON COASTLINES

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Homework

• Read pages 342 - 347

Page 32: Coastal Processes ~ erosion, transport & deposition 12.1 NC CA

Output

• Draw a block diagram of the east coast and include the features of the beaches.

• Draw a block diagram of the west coast and include the features of the beaches.